Sometimes you do just have to "go out on that limb" & try things that may work for you but not others. Obviously, we're not saying for sure that it's wrong- but mostly concerned that it could be overdone. I used to live in the desert for many years- I can appreciate what you're dealing with.
But as far as your snake shedding- he'll go into shed when his body is ready- when he's out-grown his current skin. Are you sure you're feeding the right size prey, & often enough? Just adding humidity won't create a shed cycle- it will just facilitate the process once he's grown enough & ready to shed his "old clothes".